Max RPM in a Vulcan - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 56 (permalink) Old 05-13-2013, 08:07 PM Thread Starter
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Max RPM in a Vulcan

I'm unsure about where the Vulcan-powered Tauruses are programmed to shift out of 1st gear and what is "safe" for the engine....

I know the Duratecs can get up past 6... but where are Vulcans supposed to shift?

I have a 2002 Sable Vulcan that never goes more than exactly 5k with the pedal to the medal, whereas my 2000 Sable Vulcan does about 5200 in 1st and then almost 5500 in 2nd if you hold it down.

That said, the 2002 has both stock engine and transmission at 160k and the 2002 has a rebuilt engine and transmission at 44k (244k on the car).

Is 5500 too fast for the Vulcan? What is the maximum RPM supposed to be?

Thanks!

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post #2 of 56 (permalink) Old 05-13-2013, 08:35 PM
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that sounds about right, mine does the same. It upshifts at 5k with OD on and 5.5k with normal D (you can actually max out the car in 3rd gear at 5500 that way). 5500 is safe, but people say valvesprings start to go at 5800.

Here is a quote from rogueperfomance.com:
"If you rev over 5,500 RPM's regularly, invest in a quality set of double valvesprings. If you have rev'ed over 5,800 RPM's on factory single springs, replace them now!"

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post #3 of 56 (permalink) Old 05-13-2013, 09:53 PM
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Yeah, vulcan doesn't like to go much over 5000 RPM. There's no power past that point anyway so not much point of revving it up past that.
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post #4 of 56 (permalink) Old 05-13-2013, 10:23 PM
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Sort of out of topic but I don't want to start a new thread.

What is the lowest RPM to shift in a Duratec? If I let it, it will shift at around 2,100 RPM. Is that too low or ok?
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post #5 of 56 (permalink) Old 05-13-2013, 11:07 PM
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There's no minimum RPM for shifting as long as the engine doesn't bog down too much after the gear change. 2100 RPM is normal if you're accelerating slowly.
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post #6 of 56 (permalink) Old 05-14-2013, 12:40 AM
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good, thank you
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post #7 of 56 (permalink) Old 05-14-2013, 08:26 AM
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OHV/Pushrod motors loose all power above a certain RPM so thats why it shifts down lower than the Duratec. DOHC motors have peak power throughout the curve. Although in my 2000 I felt like when going about 55mph if you floor it and it downshifts to second it revs up 5500-6500rpm and then when it shifts to 3rd gear you feel like you take off! Its like the torque drops out at those higher RPMs and you loose the oomph even though you are hitting peak HP.

The 2008 doesn't do that. It has power through the rev range and usually shifts at 6000, however sometimes will go higher or lower depending on several circumstances. Its the same way with the vulcan. When you go WOT, the PCM takes in a lot of readings and decides exactly when it should shift.

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post #8 of 56 (permalink) Old 05-14-2013, 09:20 AM
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OHV/Pushrod motors loose all power above a certain RPM........

All engines loose power above a certain RPM. That RPM is determined by many factors.... intake design and flow, the cam installed in the engine and many more factors. There are many high performance SBC and SBF pushrod motors out there that are making max HP well over 6000 RPM.

DOHC motors have peak power throughout the curve.....

No. Peak power is peak power, and occurs at a specific RPM for all engines depending on the factors noted above. 4 valve motors typically breathe better than 2 valve motors (in most cases) at higher RPM, and the cam is designed to take advantage of this. It all comes down to volumetric efficiency (VE). Typically pushrod motors have max VE at lower RPM than DOHC motors do. For ALL engines, max VE corresponds to max torque, and also best BSFC.

Remember HP(in HP) = Torque(in lbft)xRPM/5252.

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post #9 of 56 (permalink) Old 05-14-2013, 09:28 AM
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Most dont know its equal @ 5252 all mods do is shape the curve higher or lower of that point

Ive tried explaining that to alot of people they cant wrap there closed mind around the fact that hp is created by torque and the paths [email protected] 5252 thats when you know they know nothing and to not bother with them anymore

Also hp and torque are very close to the same or equal at 5252 another thing people cant understand

Last edited by ford1998taurussedohc; 05-14-2013 at 09:32 AM.
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post #10 of 56 (permalink) Old 05-14-2013, 12:59 PM
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^^^^ to add to what you said, the only MEASURED quantity (for that matter the only "real" quantity) for all engines is torque. Horsepower is a calculated quantity. Big horsepower numbers sell cars, big torque wins races.

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